Solve 9x − 8 = 118

The solution of 9x − 8 = 118 is x = 14.

9x - 8 = 118\ \Rightarrow\ x = 14

Explain it step by step in chat Make a short video of it

The lines y = 9x − 8 and y = 118 meet at x = 14. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

1
The goal is to get x alone. Undo the operations in the opposite order: first the subtraction, then the multiplication.
$9x - 8 = 118$
2
Add 8 to both sides:
$9x - 8 + 8 = 118 + 8 \ \Rightarrow\ 9x = 126$
3
Divide both sides by 9:
$\frac{9x}{9} = \frac{126}{9} \ \Rightarrow\ x = 14$
4
Check: put x = 14 back into the equation.
$9\cdot14 - 8 = 126 - 8 = 118 \checkmark$

LaTeX source of the formulas on this page

\[ 9x - 8 = 118\ \Rightarrow\ x = 14 \]
\[ 9x - 8 = 118 \]
\[ 9x - 8 + 8 = 118 + 8 \ \Rightarrow\ 9x = 126 \]
\[ \frac{9x}{9} = \frac{126}{9} \ \Rightarrow\ x = 14 \]
\[ 9\cdot14 - 8 = 126 - 8 = 118 \checkmark \]

Trying values of x in 9x − 8 = 118

x	9x − 8	Equals 118?
12	100	no
13	109	no
14	118	yes
15	127	no
16	136	no

Questions

What is x in 9x − 8 = 118?

The solution of 9x − 8 = 118 is x = 14.

How do you solve 9x − 8 = 118?

Add 8 to both sides to get 9x = 126, then divide both sides by 9 to get x = 14.

How do I check the answer?

Replace x by 14: 9(14) − 8 = 118, which is 118.

Solve 9x − 8 = 118

How to work it out

Trying values of x in 9x − 8 = 118

Questions

Similar equations